WHY DO MY PARTNER AND I FEEL TIRED ALL THE TIME!!?

ME AND MY PARTNER HAVE FELT ILL FOR OVER A YEAR NOW I MEAN TIRED ALL THE TIME LETHARGIC! WERE BOTH EARLY 30'S AND YES WE HAVE 3 CHILDREN 8YRS AND UNDER BUT ITS JUST THE LAST YEAR OR SO WE HAVE FELT LIKE THIS AND YES WE HAVE HAD EVERY BLOOD TEST FOR TIREDNESS AND WE HAVE HAD THE HOUSE TESTED FOR CARBON MONOXIDE ETC! EVERY MORNING WHEN I GET UP MY LEGS FEEL QUITE STIFF AS IF IM WALKING WITH CONCRETE BLOCKS STUCK TO MY FEET! AND I FEEL THE LETHARGIC AND STIFFNESS STEMS FROM MY LEGS UPWARDS! WE JUST DONT HAVE ANY ENERGY! COULD WE HAVE PED ON SOMETHING TO ONE ANOTHER AND IF SO WHY ISNT ANYTHING SHOWING IN THE BLOOD TEST! ALSO I HAVE DEVELOPED BACK ACNE AND MY WIFE HAS DEVELOPED FACE ACNE!! PLS HELP